Quarterly report [Sections 13 or 15(d)]

STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details)

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STOCKHOLDERS' EQUITY (Change in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 5,153,414 $ 5,052,316 $ 5,006,398 $ 4,832,639 $ 3,185,216 $ 3,142,879 $ 5,006,398 $ 3,142,879
Other comprehensive (loss) income: (125,624) 1,695 (22,401) 37,678 12,929 25,971 (146,330) 76,578
Ending balance 5,050,604 5,153,414 5,052,316 4,917,058 4,832,639 3,185,216 5,050,604 4,917,058
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (251,234)   (234,702) (294,373)   (317,142) (234,702) (317,142)
Other comprehensive income (loss) before reclassification (122,395)     35,020     (138,923) 57,721
Amounts reclassified from AOCI into earnings (8)     (3)     (12) 65
Other comprehensive (loss) income: (122,403)     35,017     (138,935) 57,786
Ending balance (373,637) (251,234)   (259,356) (294,373)   (373,637) (259,356)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (25,275)   (21,165) (26,540)   (43,078) (21,165) (43,078)
Other comprehensive income (loss) before reclassification (5,854)     (1,026)     (15,218) 7,899
Amounts reclassified from AOCI into earnings 2,701     3,889     7,955 11,502
Other comprehensive (loss) income: (3,153)     2,863     (7,263) 19,401
Ending balance (28,428) (25,275)   (23,677) (26,540)   (28,428) (23,677)
Unrealized Gains (Losses) on BOLI                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (284)   (220) 127   534 (220) 534
Other comprehensive income (loss) before reclassification 0     0     356 (10)
Amounts reclassified from AOCI into earnings (68)     (202)     (488) (599)
Other comprehensive (loss) income: (68)     (202)     (132) (609)
Ending balance (352) (284)   (75) 127   (352) (75)
AOCI Attributable to Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (276,793) (278,488) (256,087) (320,786) (333,715) (359,686) (256,087) (359,686)
Other comprehensive income (loss) before reclassification (128,249)     33,994     (153,785) 65,610
Amounts reclassified from AOCI into earnings 2,625     3,684     7,455 10,968
Other comprehensive (loss) income: (125,624) 1,695 (22,401) 37,678 12,929 25,971 (146,330) 76,578
Ending balance $ (402,417) $ (276,793) $ (278,488) $ (283,108) $ (320,786) $ (333,715) $ (402,417) $ (283,108)